Park IR-1.2 Internal Cable Routing Tool KitIf you own an internally routed bike, this will become your favourite tool! Before we used this product, we struggled with certain frames that had difficult routeing. The IR 1. 2 kit features several different cables for different uses and they make life much easier! They use strong magnets which allow you to pre guide these cables through the frame and offer different ends to pull the main housing through. It's brilliant!